498
FNCA52 TJSJ 211930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST MON SEP 21 2026
DISCUSSION
NO FIRE DANGER IS EXPECTED TODAY.
PRZ014-220800-
SOUTHEAST COASTAL PLAINS-
330 PM AST MON SEP 21 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 30 10 30
TEMP (24H TREND) 74 (-2) 91 (+2) 74 91
RH % (24H TREND) 93 (+5) 52 (-7) 91 50
WIND 20FT/EARLY(MPH) E 8 E 12 E 9 E 14
WIND 20FT/LATE(MPH) E 6 SE 12 NE 9 SE 14
MIXING HGT(FT-AGL/MSL) 4740 5160
TRANSPORT WND (MPH) E 12 E 15
VENT RATE (KT-FT) 47400 67080
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-220800-
SOUTHERN HILLS-
330 PM AST MON SEP 21 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 50 10 30
TEMP (24H TREND) 71 (-3) 89 (+4) 71 89
RH % (24H TREND) 99 (+6) 62 (-7) 98 61
WIND 20FT/EARLY(MPH) E 6 E 10 E 8 E 11
WIND 20FT/LATE(MPH) E 6 SE 10 E 9 SE 11
MIXING HGT(FT-AGL/MSL) 5510 5850
TRANSPORT WND (MPH) E 10 E 13
VENT RATE (KT-FT) 49590 64350
DISPERSION 5 5
DSI 2 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-220800-
NORTH COASTAL PLAINS-
330 PM AST MON SEP 21 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 50 50 20 40
TEMP (24H TREND) 74 (-2) 91 (+1) 74 91
RH % (24H TREND) 99 (+4) 61 (-5) 99 63
WIND 20FT/EARLY(MPH) SE 9 E 10 SE 10 E 12
WIND 20FT/LATE(MPH) SE 6 E 12 SE 8 E 16
MIXING HGT(FT-AGL/MSL) 4830 5230
TRANSPORT WND (MPH) E 9 E 14
VENT RATE (KT-FT) 38640 62760
DISPERSION 5 5
DSI 2 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-220800-
NORTHERN HILLS-
330 PM AST MON SEP 21 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 60 30 50
TEMP (24H TREND) 71 (-2) 90 (+2) 71 89
RH % (24H TREND) 100 (+2) 65 (-2) 99 64
WIND 20FT/EARLY(MPH) LGT/VAR E 9 SE 8 E 11
WIND 20FT/LATE(MPH) LGT/VAR E 10 SE 5 E 13
MIXING HGT(FT-AGL/MSL) 5530 5930
TRANSPORT WND (MPH) SE 7 E 9
VENT RATE (KT-FT) 33180 47440
DISPERSION 5 5
DSI 2 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-220800-
WEST COAST-
330 PM AST MON SEP 21 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 40 80 30 30
TEMP (24H TREND) 73 (-2) 92 (+1) 73 92
RH % (24H TREND) 99 (+4) 63 (-3) 99 62
WIND 20FT/EARLY(MPH) E 10 E 11 E 8 E 11
WIND 20FT/LATE(MPH) E 9 E 11 E 9 E 12
MIXING HGT(FT-AGL/MSL) 4860 4830
TRANSPORT WND (MPH) SE 8 SE 10
VENT RATE (KT-FT) 34020 43470
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-220800-
EASTERN INTERIOR-
330 PM AST MON SEP 21 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 60 30 40
TEMP (24H TREND) 72 (-3) 90 (+2) 72 90
RH % (24H TREND) 98 (+4) 61 (-3) 98 61
WIND 20FT/EARLY(MPH) SE 9 SE 10 E 11 E 11
WIND 20FT/LATE(MPH) SE 8 SE 11 E 10 E 13
MIXING HGT(FT-AGL/MSL) 5920 6520
TRANSPORT WND (MPH) SE 10 SE 14
VENT RATE (KT-FT) 53280 78240
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-220800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST MON SEP 21 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 60 30 40
TEMP (24H TREND) 70 (-3) 85 (+2) 70 85
RH % (24H TREND) 100 (+4) 64 (-6) 99 66
WIND 20FT/EARLY(MPH) SE 6 SE 9 E 8 E 10
WIND 20FT/LATE(MPH) SE 5 SE 9 E 8 E 11
MIXING HGT(FT-AGL/MSL) 4230 4400
TRANSPORT WND (MPH) SE 10 E 15
VENT RATE (KT-FT) 38070 57200
DISPERSION 5 5
DSI 3 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-220800-
CENTRAL MOUNTAIN RANGE-
330 PM AST MON SEP 21 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 40 80 20 30
TEMP (24H TREND) 68 (-3) 87 (+4) 68 87
RH % (24H TREND) 99 (+2) 68 (-6) 99 66
WIND 20FT/EARLY(MPH) SE 5 SE 8 SE 6 E 9
WIND 20FT/LATE(MPH) LGT/VAR SE 8 E 5 E 9
MIXING HGT(FT-AGL/MSL) 6050 6670
TRANSPORT WND (MPH) SE 8 SE 8
VENT RATE (KT-FT) 42350 46690
DISPERSION 5 5
DSI 1 6 1 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-220800-
CAYEY MOUNTAIN RANGE-
330 PM AST MON SEP 21 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 30 40
TEMP (24H TREND) 70 (-3) 85 (+2) 71 86
RH % (24H TREND) 100 (+3) 66 (-4) 99 67
WIND 20FT/EARLY(MPH) SE 5 E 9 E 6 E 10
WIND 20FT/LATE(MPH) E 5 SE 9 E 6 E 11
MIXING HGT(FT-AGL/MSL) 5060 5290
TRANSPORT WND (MPH) E 10 E 14
VENT RATE (KT-FT) 45540 63480
DISPERSION 5 5
DSI 3 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-220800-
VIEQUES-
330 PM AST MON SEP 21 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 40 30 40
TEMP (24H TREND) 78 (-2) 90 (+1) 78 90
RH % (24H TREND) 86 (+4) 57 (-4) 87 58
WIND 20FT/EARLY(MPH) SE 11 SE 11 E 13 E 12
WIND 20FT/LATE(MPH) E 10 E 10 E 13 E 12
MIXING HGT(FT-AGL/MSL) 3390 3340
TRANSPORT WND (MPH) E 13 E 15
VENT RATE (KT-FT) 37290 43420
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-220800-
CULEBRA-
330 PM AST MON SEP 21 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 40 30 30
TEMP (24H TREND) 79 (-2) 91 (+2) 79 91
RH % (24H TREND) 87 (+5) 59 (-6) 89 60
WIND 20FT/EARLY(MPH) E 11 E 11 E 13 E 12
WIND 20FT/LATE(MPH) E 10 E 10 E 13 E 12
MIXING HGT(FT-AGL/MSL) 3430 3340
TRANSPORT WND (MPH) E 14 E 16
VENT RATE (KT-FT) 41160 46760
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-220800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST MON SEP 21 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 20 30
TEMP (24H TREND) 75 (-2) 92 (+2) 75 91
RH % (24H TREND) 95 (+5) 53 (-5) 96 50
WIND 20FT/EARLY(MPH) E 13 E 14 E 10 E 16
WIND 20FT/LATE(MPH) E 11 SE 16 E 11 SE 17
MIXING HGT(FT-AGL/MSL) 5010 5140
TRANSPORT WND (MPH) SE 14 E 17
VENT RATE (KT-FT) 60120 77100
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-220800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST MON SEP 21 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 30 30 30
TEMP (24H TREND) 77 (-3) 88 (+1) 77 88
RH % (24H TREND) 89 (+6) 62 (-4) 90 64
WIND 20FT/EARLY(MPH) E 11 E 11 E 13 E 13
WIND 20FT/LATE(MPH) E 11 E 10 E 13 E 13
MIXING HGT(FT-AGL/MSL) 3520 3300
TRANSPORT WND (MPH) E 14 E 16
VENT RATE (KT-FT) 42240 46200
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-220800-
ST CROIX-
330 PM AST MON SEP 21 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 30 20 30
TEMP (24H TREND) 78 (-2) 90 (+2) 78 90
RH % (24H TREND) 91 (+5) 63 (-4) 91 64
WIND 20FT/EARLY(MPH) E 10 E 11 E 12 E 13
WIND 20FT/LATE(MPH) E 10 E 10 E 12 E 13
MIXING HGT(FT-AGL/MSL) 4620 4620
TRANSPORT WND (MPH) E 13 E 16
VENT RATE (KT-FT) 50820 64680
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
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